TTL and Light modifiers

Started Mar 11, 2013 | Questions thread
sacentre Senior Member • Posts: 1,725
Re: TTL and Light modifiers

Not a dumb question at all.

See this thread I started in May 2011 in which I asked why my shots were underexposing when using a Canon 580 EXII under the following conditions

a) with a modifier on the flash (flash is on camera or off with OC-E3 cable - makes no difference)

b) the flash head horizontal and pointing straight forward

c) using an EF lens (eg Canon 24-105mm zoom) where distance information is being sent to the flash

See especially this reply for a detailed explanation

Bottom line is learn to control the light manually and use E-TTL only when you have no choice.


Texchappy wrote:

Hopefully not too dumb a question but here goes...

How do modifiers (umbrellas/softboxes) effect TTL (specifically Canon E-TTL)?

TIA, Tony

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